.yt-iframe-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 56.25%;
}
.yt-iframe-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
html {
    font-family: "Segoe UI", SegoeUI, Roboto, "Segoe WP", "Helvetica Neue", "Helvetica", "Tahoma", "Arial", sans-serif !important;
}